A common krill of the subarctic Atlantic and Pacific, and adjacent Arctic seas

Transparent, yellowish if rich in lipids, females might develop blue hue when spawning; Eyes round, rostrum pointed, photophores red; Anntennae lack lappet, carapace without denticle; well-developed spine on 6th abdominal segment

Arctic Ocean, Barents Sea, Canadian Exclusive Economic Zone [Pacific part], Canadian part of the Arctic Ocean, Cobscook Bay, European waters (ERMS scope), FAO fishing area 18, FAO fishing area 67, Gulf of Maine, Gulf of St. Lawrence, Irish Exclusive economic Zone, Mediterranean Sea, North East Pacific, North Pacific, North West Atlantic, Saguenay Fjord, Storfjordrenna, Storfjords, United Kingdom Exclusive Economic Zone

depth in m: 200-300; horizontal distribution: amphiboreal species, N Pacific, N Atlantic

Arctic to Gulf of Maine

Amphiboreal species; found in the Barents Sea, White Sea, Kara Sea, Bering Sea, Sea of Okhotsk.

The last segment of the abdomen carries a dorsal spine. The front edge of the carapace is transformed into an elongate rostrum. Uropods are shorter than the telson.

Length up to 30 mm.

Differs from other Thysanoessa species by the presence of a dorsal spine on the last segment of the abdomen.

upper and glacial epipelagic regions of the Gulf and estuary, and the upper Mesopelagic of the Gulf and estuary

Depth range based on 681 specimens in 2 taxa.
Water temperature and chemistry ranges based on 509 samples.

Environmental ranges
  Depth range (m): 0 - 875
  Temperature range (°C): -1.589 - 12.863
  Nitrate (umol/L): 0.367 - 34.597
  Salinity (PPS): 25.948 - 35.590
  Oxygen (ml/l): 4.017 - 9.281
  Phosphate (umol/l): 0.182 - 2.965
  Silicate (umol/l): 2.327 - 72.502

Graphical representation

Depth range (m): 0 - 875

Temperature range (°C): -1.589 - 12.863

Nitrate (umol/L): 0.367 - 34.597

Salinity (PPS): 25.948 - 35.590

Oxygen (ml/l): 4.017 - 9.281

Phosphate (umol/l): 0.182 - 2.965

Silicate (umol/l): 2.327 - 72.502
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

Subarctic in deeper coastal waters and shelf breaks; Common in Arctic waters near Pacific or Atlantic inflows, uncommon in central basins; Undergo diel vertical migrations, spending daytime near bottom or to maxiamum of ~500 m, night-time in surface waters

Primarily herbivourous, may feed on detritous when food scarse; During open-water periods feed on phytoplankton when abundant (shifting to small zooplankton when phyoplankton less abundant); An important prey item for fish, birds, seals and whales

Females lay several clutches of eggs (140 per brood on average) during spring; Females require repeated mating after each molt to form new egg clutches; Life cycles is typcial: eggs, nauplius, metanauplius, followed by several stages of feeding calytopsis, and furcillia larvae; Juveniles resemble adults, and molt regularly while growing to adulthood over the first year of life; Life expectancy not known, likely 1-2 years

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 7
Species With Barcodes: 1

Important food source for herring.